package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

/**
 * 课程内容管理的实现类
 */
public class CourseContentDaoImpl implements CourseContentDao {

    /**
     * 根据课程id查询所有章节信息
     * @param courseId
     * @return
     */
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {
        try {
            QueryRunner queryRunner = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT \n" +
                    "\tid,\n" +
                    "\tcourse_id,\n" +
                    "\tsection_name,\n" +
                    "\tdescription,\n" +
                    "\torder_num,\n" +
                    "\tSTATUS\n" +
                    "FROM course_section WHERE course_id = ?";
            List<Course_Section> sectionList = queryRunner.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            //根据章节id查询课时信息
            for (Course_Section section : sectionList) {

                //调用方法，获取章节对应的课时
                List<Course_Lesson> lessonList = findLessonBySectionId(section.getId());

                //将数据封装到章节对象中
                section.setLessonList(lessonList);
            }
            return sectionList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据章节id查询章节的所有课时信息
    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {
        try {
            QueryRunner queryRunner = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT \n" +
                    "\tid,\n" +
                    "\tcourse_id,\n" +
                    "\tsection_id,\n" +
                    "\ttheme,\n" +
                    "\tduration,\n" +
                    "\tis_free,\n" +
                    "\torder_num,\n" +
                    "\tSTATUS\n" +
                    "FROM course_lesson WHERE section_id = ?";
            List<Course_Lesson> lessonList = queryRunner.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);
            return lessonList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据课程id 回显课程信息
    @Override
    public Course findCourseByCourseId(int courseId) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT id,course_name FROM course WHERE id = ?";
            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);
            return course;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    //保存章节信息
    @Override
    public int saveSection(Course_Section section) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "INSERT INTO course_section (\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time) \n" +
                    "VALUES (?,?,?,?,?,?,?)";
            Object[] param = {section.getCourse_id(),section.getSection_name(),section.getDescription(),
                              section.getOrder_num(),section.getStatus(),section.getCreate_time(),
                              section.getUpdate_time()};
            int row = qr.update(sql, param);
            return row;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节信息
    @Override
    public int updateSection(Course_Section section) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET\n" +
                    "section_name = ?,\n" +
                    "description = ?,\n" +
                    "order_num = ?,\n" +
                    "update_time = ?\n" +
                    "WHERE id = ?";
            Object[] param = {section.getSection_name(),section.getDescription(),section.getOrder_num(),
                              section.getUpdate_time(),section.getId()};
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节状态
    @Override
    public int updateSectionStatus(int id, int status) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET STATUS = ? ,update_time = ? WHERE id = ?";

            Object[] param = {status,DateUtils.getDateFormart(),id};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //添加课时信息
    @Override
    public int saveLesson(Course_Lesson lesson) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "INSERT INTO course_lesson (\n" +
                    "\tcourse_id,\n" +
                    "\tsection_id,\n" +
                    "\ttheme,\n" +
                    "\tduration,\n" +
                    "\tis_free,\n" +
                    "\torder_num,\n" +
                    "\tSTATUS,\n" +
                    "\tcreate_time,\n" +
                    "\tupdate_time)\n" +
                    "VALUES (?,?,?,?,?,?,?,?,?)";
            Object[] param = {lesson.getCourse_id(),lesson.getSection_id(),lesson.getTheme(),lesson.getDuration(),
                              lesson.getIs_free(),lesson.getOrderNum(),lesson.getStatus(),lesson.getCreate_time(),
                              lesson.getUpdate_time()};
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课时信息
    @Override
    public int updateLesson(Course_Lesson lesson) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "UPDATE course_lesson SET\n" +
                    "course_id = ?,\n" +
                    "section_id = ?,\n" +
                    "theme = ?,\n" +
                    "duration = ?,\n" +
                    "is_free = ?,\n" +
                    "order_num = ?,\n" +
                    "update_time = ?\n" +
                    "WHERE id = ?";
            Object[] param = {lesson.getCourse_id(),lesson.getSection_id(),lesson.getTheme(),lesson.getDuration(),
                              lesson.getIs_free(),lesson.getOrderNum(),lesson.getUpdate_time(),lesson.getId()};
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
